package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;


@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        //属性拷贝
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishid = dish.getId();

        //获取口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishid);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }


    /**
     * 菜品批量删除
     * @param ids
     * @return
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否能够删除？ 是否启用
        for(Long id : ids){
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }

        //判断菜品是否关联套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size()>0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品
        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品关联的口味
            dishFlavorMapper.deleteByDishId(id);
        }

    }

    /**
     * 根据id查询菜品和口味
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据id查询口味数据
        List<DishFlavor> dishFlavors = dishMapper.getByDishId(id);

        //将查询到的结果封装到DishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }


    /**
     * 根基id修改菜品基本信息和口味
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品基本信息
        dishMapper.update(dish);

        //删除原有口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }


    /**
     * 菜品启售停售
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {

        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if(status == StatusConstant.DISABLE){
            //如果是停售操作，还要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
               // 得到包含当前菜品的套餐的id
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();

                    setmealMapper.update(setmeal);
                }
            }
        }
    }


    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    @ApiOperation("根据分类id查询菜品")
    public List<Dish> list(Long categoryId) {
        //查询的菜品必须在该分类下而且启用
        Dish dish= Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        return dishMapper.list(dish);
    }




    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
